Precision vs Accuracy
| Precision | Accuracy | |
|---|---|---|
| Spread around average value | Closeness to actual value | |
| Affected by | Random error | Systematic error |
| How to improve |
Repeat and average Plot and graph line of best fit |
Accurate instrument Good technique |
Random error vs Systematic error
| Random | Systematic |
|---|---|
| Error is inconsistent | Error is consistent |
| Error in both directions | Error in one direction |
| Can only be reduced | Can be eliminated |
| Source | Source |
| Parallax error | Zero error |
| Reaction time error | Faulty instrument |
| Environmental factors (wind, temperature) |